Cooler box



FIG. 1 is a front view of a cooler box showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front perspective view thereof.

The broken lines and areas within them in the drawings depict portions of the cooler box that form no part of the claimed design. 

CLAIM The ornamental design for a cooler box, as shown and described. 